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See Chinese contents: HG/T 20627-2009 HG/T 20627-2009: Non-metallic flat gaskets for use with steel pipe flanges (Class designated)
This standard specifies the type, dimension and technical requirements of non-metallic flat gaskets (with insertion or without insertion) for use with steel pipe flanges. This standard is applicable to the non-metallic flat gaskets for use with steel pipe flanges whose nominal pressures from C1assl50 (PN20)-C1ass600 (PN110) are specified in HG/T 20615 and HG/T 20623.
